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A fracturing fluid system with surface activity after gel breaking

A surface-active, jelly fracturing fluid technology, applied in the direction of drilling compositions, chemical instruments and methods, can solve the problems of vegetable glue stability, poor construction performance, and inability to meet deep well and large-scale fracturing construction, etc. Achieve the effects of strong flowback ability, good rheology, and excellent reservoir protection performance

Active Publication Date: 2015-10-28
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The application of surfactant-based fracturing fluids and plant-based fracturing fluids has a certain scale at home and abroad. Surfactant fracturing fluids have strong flowback capabilities, but their construction performance is not as stable as that of plant-based fracturing fluids, which cannot meet deep well and large-scale fracturing operations.

Method used

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  • A fracturing fluid system with surface activity after gel breaking
  • A fracturing fluid system with surface activity after gel breaking
  • A fracturing fluid system with surface activity after gel breaking

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Add 96.0 parts of clear water by weight in the field container, then slowly add 1.0 parts of dodecyl grafted guar gum under the condition of pump circulation, then add 1.0 parts of clay stabilizer KCl and 2.0 parts of temperature stabilizer triethanolamine, Continue to cycle for 10 minutes. Continue to circulate and top up with liquid for 20 minutes to ensure that the liquid is well mixed to form Solution A.

[0028] Just before construction, pour 2.0 parts of cross-linking agent by weight into a container filled with 97.9 parts of clear water and add 0.1 part of gel breaker potassium persulfate as solution B.

[0029] During fracturing construction, while pumping solution A, mix solution B according to the volume ratio of A:B=100:1.2 to form jelly fracturing fluid.

Embodiment 2

[0031] Add 98.4 parts of clear water by weight to the on-site container, then slowly add 0.01 part of dodecyl grafted guar gum under the condition of pump circulation, and then add 1.0 part of clay stabilizer KCl according to the formula ratio, and continue to circulate for 10 minutes. Continue to circulate and top up the fluid for 20 minutes to ensure the fluid is well mixed for a slick water fracturing fluid.

Embodiment 3

[0033] Prepare slick water fracturing fluid according to the following proportions:

[0034] Lauryl grafted guar gum 0.15 parts

[0035] NH 4 Cl 0.5 parts

[0036] 96.0 parts of water.

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Abstract

The invention relates to a fracturing liquid system having surface activity after gel breaking. The jelly fracturing liquid comprises a solution A and a solution B, wherein the solution A comprises the following components in parts by weight: 0.1-1.0 part of dodecyl grafting guar gum, 1.0-2.0 part of temperature stabilizer, 0.5-1.0 part of clay stabilizer and 96.0-98.4 parts of water; and the solution B comprises the following components in parts by weight: 0.5-2.0 parts of crosslinking agent, 0.01-0.1 part of gel breaker and 97.9-99.5 part of water; and the jelly fracturing liquid is prepared by mixing the solution A and the solution B in volumetric proportion of 100: (0.5-2.0). The jelly fracturing liquid has relatively good flowing deformation and gel breaking performance and can meet the requirements on long-crack and high sand ratio construction as well as the requirements on mixed water fracturing large displacement and low friction construction.

Description

technical field [0001] The invention relates to a fracturing fluid system which can improve the flowback performance of the fracturing fluid and reduce formation damage and can be used as a jelly fracturing fluid or slick water fracturing fluid. Background technique [0002] The development of unconventional oil and gas reservoirs has become a new focus of global energy development. The contribution of unconventional oil and gas reservoirs to the world's energy has increased from 30% in 2000 to nearly 50% today. The emerging concept of volume fracturing is tight oil reservoir stimulation technology Infused with new vitality. Tight oil reservoir stimulation has always been a key task in the exploration and development of Changqing Oilfield. With the continuous updating and deepening of reservoir conditions, stimulation methods, and evaluation concepts, it is necessary to continuously improve the performance of reservoir stimulation and reservoir protection in the fracturing f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/68
Inventor 吴江杨华徐永高慕立俊赵振峰李宪文赵文丁里吕海燕吕宝强周晓群
Owner PETROCHINA CO LTD
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